【摘要】 多相永磁同步电机驱动系统具有较强的容错运行能力。以非正弦反电动势五相永磁同步电机为研究对象，在缺一相故障下，通过降阶变换矩阵，分别构建基波和三次谐波空间同步坐标系下的转矩方程；同时，为消除故障后产生的二、四次转矩脉动，分析三次谐波电流注入率选取的方法，并根据最小铜耗及最大转矩原则对参考电流进行优化；针对传统PI控制器无法对交流参考电流进行精确跟踪的问题，在PI控制基础上，设计准比例谐振（Quasi-proportional resonance,QPR）+PI控制器来对同步坐标系下交流参考电流进行精确跟踪。仿真和试验结果表明，转矩脉动得到了有效抑制，并且QPR+PI控制器实现了对交流电流信号的精确跟踪。更多还原

【Abstract】 The multi-phase permanent magnet synchronous motor drive system has strong fault-tolerant operation ability. The non-sinusoidal back-EMF five-phase permanent magnet synchronous motor is taken as the research object. By adopting the reduced order transformation matrix, the torque equations at fundamental and the third harmonic space are constructed under the single-phase fault. And in order to eliminate the second and fourth torque ripples under the fault, the method of selecting the third harmonic current injection rate is analyzed, and the reference current are optimized according to the principle of minimum copper loss and maximum torque. In addition, to address the inability of traditional PI controller to track the AC reference current in an accurate way, a Quasi-proportional resonance（QPR） +PI controller is designed on the basis of PI control to ensure the accuracy in tracking the AC reference current in the synchronous coordinate system. The simulation results demonstrate that the torque ripple are effectively suppressed, and the QPR + PI controller can accurately track the AC current signal.更多还原